Android Widget组件ScrollView是本文要介绍的内容。主要是来了解并学习Android Widget组件应用,具体内容来看本文详解。
一个可以下拉滚动条的视图区域
- <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content">
Button
按钮
获取并设置事件及委托
- Button button = (Button) findViewById(R.id.button);
- button.setOnClickListener(button_listener);
在点击事件方法里面设置了程序标题
- private Button.OnClickListener button_listener = new Button.OnClickListener() {
- public void onClick(View v) {
- setTitle("哎呦,button被点了一下");
- }
- };
在点击事件方法里面跳转到Activity 这个和之前的SetContentView(R.Layout.xxx)不一样,后者是绑定到指定模板。
- private Button.OnClickListener text_view_button_listener = new Button.OnClickListener() {
- public void onClick(View v) {
- Intent intent = new Intent();
- intent.setClass(MainActivity.this, ViewTextActivity.class);
- startActivity(intent);
- }
- };
TextView
文本显示和Label类似,下面是实现
- <TextView
- android:id="@+id/text_view"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:textSize="16sp"
- android:textColor="#ffffff"
- android:padding="10dip"
- android:background="#cc0000"
- android:text="这里是TextView,你可以在这里输入需要显示的文字信息.."
- />
java实现修改TextView 的值
- TextView text_view = (TextView) findViewById(R.id.text_view);
- CharSequence text_viewtext_view_old = text_view.getText();
- text_view.setText("修改前是:" + text_view_old
- + "\n修改为:TextView的值也是可以动态修改的.");
在AndroidManifest.xml 里面注册一个Activity
EditText
文本输入框
- <EditText android:id="@+id/edit_text"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="这里可以输入文字" />
CheckBox
复选框
- <CheckBox android:id="@+id/plain_cb"
- android:text="Plain"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- />
获得是否选中
- plain_cb = (CheckBox) findViewById(R.id.plain_cb);
- if (plain_cb.isChecked()) {
- rr = r + "," + plain_cb.getText();
- }
RadioGroup
单选框按钮组
- <RadioGroup
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:orientation="vertical"
- android:checkedButton="@+id/lunch"
- android:id="@+id/menu">
- <RadioButton
- android:text="breakfast"
- android:id="@+id/breakfast"
- />
- <RadioButton
- android:text="lunch"
- android:id="@id/lunch" />
- <RadioButton
- android:text="dinner"
- android:id="@+id/dinner" />
- <RadioButton
- android:text="all"
- android:id="@+id/all" />
- </RadioGroup>
清除选择
- mRadioGroup = (RadioGroup) findViewById(R.id.menu);
- Button clearButton = (Button) findViewById(R.id.clear);
- clearButton.setOnClickListener(this);
- public void onClick(View v) {
- mRadioGroup.clearCheck();
- }
Spinner
下拉框 //86页
- <Spinner android:id="@+id/spinner_1"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:drawSelectorOnTop="false"
- />
- private static final String[] mCountries = { "China" ,"Russia", "Germany",
- "Ukraine", "Belarus", "USA" };
- private void find_and_modify_view() {
- //数组填充
- spinner_c = (Spinner) findViewById(R.id.spinner_1);
- allcountries = new ArrayList<String>();
- for (int i = 0; i < mCountries.length; i++) {
- allcountries.add(mCountries[i]);
- }
- aspnCountries = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, allcountries);
- aspnCountries .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
- spinner_c.setAdapter(aspnCountries);
- //XML填充
- spinner_2 = (Spinner) findViewById(R.id.spinner_2);
- ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource( this, R.array.countries, android.R.layout.simple_spinner_item);
- adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
- spinner_2.setAdapter(adapter);
- }
- //遗留问题android.R.layout.simple_spinner_item 在那里可以看到。
AutoCompleteTextView
自动完成文本框
- <AutoCompleteTextView android:id="@+id/auto_complete"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"/
将一个数组赋值给自动完成文本框
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.autocomplete);
- setTitle("AutoCompleteTextViewActivity");
- ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
- android.R.layout.simple_dropdown_item_1line, COUNTRIES);
- AutoCompleteTextView textView = (AutoCompleteTextView) findViewById(R.id.auto_complete);
- textView.setAdapter(adapter);
- }
- static final String[] COUNTRIES = new String[] {
- "China" ,"Russia", "Germany",
- "Ukraine", "Belarus", "USA" ,"China1" ,"China12", "Germany",
- "Russia2", "Belarus", "USA"
- };
DatePicker
日期选择控件
- <DatePicker
- android:id="@+id/date_picker"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content" />
初始化日期选择控件
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setTitle("CheckBoxActivity");
- setContentView(R.layout.date_picker);
- DatePicker dp = (DatePicker)this.findViewById(R.id.date_picker);
- dp.init(2009, 5, 17, null);
- }
TimePicker
时间控件
- <TimePicker
- android:id="@+id/time_picker"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"/>
后台设置24小时视图
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setTitle("TimePickerActivity");
- setContentView(R.layout.time_picker);
- TimePicker tp = (TimePicker)this.findViewById(R.id.time_picker);
- tp.setIs24HourView(true);
- }
ProgressBar
圆形进度条
- <ProgressBar
- android:id="@+id/progress_bar"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"/>
水平进度条
- <ProgressBar android:id="@+id/progress_horizontal"
- style="?android:attr/progressBarStyleHorizontal"
- android:layout_width="200dip"
- android:layout_height="wrap_content"
- android:max="100"
- android:progress="50"
- android:secondaryProgress="75" />
- </LinearLayout>
SeekBar
拖动栏目
- <SeekBar
- android:id="@+id/seek"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:max="100"
- android:thumb="@drawable/seeker"
- android:progress="50"/>
RatingBar
星评级
- <RatingBar android:id="@+id/rating_bar"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- ratingBarStyleSmall="true" />
ImageView
图片控件,显示一个图片
- <ImageView
- android:id="@+id/imagebutton"
- android:src="@drawable/eoe" //图片存储在资源文件夹
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"/>
ImageButton
图片按钮
- <ImageButton android:id="@+id/imagebuttonaa"
- android:src="@drawable/play"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"/>
ImageSwitcher 和 Gallery
展示图片
- <ImageSwitcher
- android:id="@+id/switcher"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:layout_alignParentTop="true"
- android:layout_alignParentLeft="true" />
- <Gallery android:id="@+id/gallery"
- android:background="#55000000"
- android:layout_width="fill_parent"
- android:layout_height="60dp"
- android:layout_alignParentBottom="true"
- android:layout_alignParentLeft="true"
- android:gravity="center_vertical"
- android:spacing="16dp" />
GridView 格子展示控件
- <GridView xmlns:android="http://schemas.android.com/apk/res/android"
- android:id="@+id/grid_view"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:numColumns="auto_fit"
- android:verticalSpacing="10dp"
- android:horizontalSpacing="10dp"
- android:columnWidth="90dp"
- android:stretchMode="columnWidth"
- android:gravity="center"
- />
Tab 选项卡
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setTitle("TabDemoActivity");
- TabHost tabHost = getTabHost();
- LayoutInflater.from(this).inflate(R.layout.tab_demo,
- tabHost.getTabContentView(), true);
- tabHost.addTab(tabHost.newTabSpec("tab1").setIndicator("tab1")
- .setContent(R.id.view1));
- tabHost.addTab(tabHost.newTabSpec("tab3").setIndicator("tab2")
- .setContent(R.id.view2));
- tabHost.addTab(tabHost.newTabSpec("tab3").setIndicator("tab3")
- .setContent(R.id.view3));
- }
小结:Android Widget组件ScrollView的内容介绍完了,希望通过Android Widget组件内容的学习能对你有所帮助!